Journal
CRYSTENGCOMM
Volume 16, Issue 16, Pages 3289-3295Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ce42410c
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Funding
- National Natural Science Foundation of China [51372013, 21177007]
- Beijing Natural Science Foundation [8112022]
- Beijing Key Laboratory of Environmentally Harmful Chemicals Analysis
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Zero-dimensional Fe2O3 nanoparticles were successfully decorated on three-dimensional WO3 architectures to constitute a photocatalyst of Fe2O3@WO3 heterojunction. The obtained samples were characterized in detail by X-ray diffraction, scanning electron microscopy, elemental mapping, X-ray photoelectron spectroscopy and UV-Vis absorption spectra. The results indicate that rhombohedral alpha-Fe2O3 nanoparticles are homogeneously decorated on the surface of monoclinic WO3 architectures, and the constituted n(+)-n heterojunction results in redshift of the optical absorption. The photocatalyst of 1%Fe2O3@WO3 annealed at 400 degrees C exhibits the highest photocatalytic activity for degradation of Rhodamine B under visible light irradiation. The degradation obeys first-order reaction kinetics with an apparent rate constant of 0.057 min(-1). It is suggested that the potential-energy difference between Fe2O3 and WO3 accelerates the separation of photogenerated electron-hole pairs, dominating the enhanced photocatalytic activity. The results presented herein provide new insight for development of a novel visible-light-driven photocatalyst and its potential application in harmful pollutant degradation.
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